<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>lesson 30</title>
  <style>
    .area {
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      width: 200px;
      height: 300px;
      background: green;
    }
    .mask {
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      bottom: 0;
      background: #000;
      opacity: 0.5;
      color: #fff;
      font-size: 100px;
    }
  </style>
  <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
  <div id="root"></div>
  <div id="hello"></div>
</body>
<script>
  // teleport 传送门
  const app = Vue.createApp({
    data() {
      return {
        show: false,
        message: 'hello'
      }
    },
    methods: {
      handleBtnClick() {
        this.show = !this.show;
      }
    },
    template: `
      <div class="area">
        <button @click="handleBtnClick">按钮</button>
        <teleport to="#hello">
          <div class="mask" v-show="show">{{message}}</div>
        </teleport>
      </div>
    `
  });

  const vm = app.mount('#root');
</script>
</html> 
